You are right, I am using a bag skirt, it is a "standard" one; closed "tube" fed throug holes in the hull.

The dimensions are 1/4 scale: 75cm/45cm.

What you see and marked in the picture is the "drag flap", old solution for racing in water, there are other solutions to avoid drag and water entring in the rear fingers such as; closing the rear fingers and even (only if you have a lot of expendable cushion mass of air) just taking some fingers out of the craft rear...

Hi Carlos
Dont you think that 3 minutes of running time is a bit too little? Compared to mine hovercraft 9 minutes with 1x5000mah battery. I have 2 powerful edf-s running at the same time. Where's the big difference in power consumption?

I use two different set ups;
- I have one for special demos using the Byron ducted fan and
KB45-10L 1800kv Brushless Inrunner
Weight: 449gHighest rated power: 2808W

With this set up and "driving like a crazy" for public joy, with fast and constant accelerations, drifting, spinning, etc. It is too much power consumption because the same batterie suplies also the lift engine:

I use two different set ups;
- I have one for special demos using the Byron ducted fan and
KB45-10L 1800kv Brushless Inrunner
Weight: 449gHighest rated power: 2808W

With this set up and "driving like a crazy" for public joy, with fast and constant accelerations, drifting, spinning, etc. It is too much power consumption because the same batterie suplies also the lift engine: